INK COMPOSITION FOR INKJET RECORDING, RECORDING DEVICE AND RECORDED MATTER

摘要

PROBLEM TO BE SOLVED: To provide a pigment ink composition with improved color development.SOLUTION: An ink composition contains: a pigment; a copolymer comprising a phosphoric acid group or phosphonic acid group; a hydrosoluble solvent; and water, wherein the pigment is represented by the formula 1 and satisfies the relation Y/X≤0.20 where X represents a peak intensity at a Bragg angle (2&thetas;±0.2°)=26.5-27.5° and Y represents a peak intensity at a Bragg angle (2&thetas;±0.2°)=11.0-11.5° to a CuKα X-ray having a wavelength of 1.541Å.